Abrading apparatus



Sept. 14, 1943. w; 1. KEEFER 2,329,203

ABRADING APPARATUS Original Filed March 10, 1938 5 Sheets-Sheet 1 I r I 2 36 11 Sept. 14, 1943. w. KEEFER' 2,329,203

I ABRADING APPARATUS Original Filed March 10, 1938 v 5 Sheets-Sheet 2 g2, 20 21 i 2 am 2L WaIi'e -LJQqer m Ja -0mm aw:

flwzwws 3145mm I I Sept. 14, 1943. w. L. KEEFER 2 ABRADING APPARATUS Original Filec l March- 10, 1938 5 Sheets-Sheet 3 Wqll'er l1. Kegfer central opening 25 to receive the transfer mech anism. Seated in opening 25 is the base of what may be called a rotary cup C. The cup is provided with a closed bottom 26, and it is secured to hub H! by means of acap screw 21. As seen in Figs. 1, 4, and 5; cup C is also provided with an axially extending generally cylindricalflange 28 which terminates closely' adjacent a plane passing through the medial portion of the blade? the flange is serrated or notched for effecting a able manner, but preferably metered and from a gravity drop to impart the desired initial velocity to the abrasive. The abrasivesfed into the spout is quickly conveyed to the center of cup C and promptly attainsthefull peripheral'speed I v of the cup. After av predeterminedquantity of abrasive has accumulated in the cup, it builds up to its angle of repose therein. If the feed of abrasive to the cup be arrested at this point, it will remain on the wall of the cupand will not discharge over edge 33. In Fig. l, the surface discharge onto the inner. ends of "the blades in" timed relationship thereto. A plurality of webs 3| (Figs. 8 and 9) are provided in the bottom of'the cup for the purpose of strengthening it.

Cup C is also provided'with apair ofannular grooves 32which function to assist the abrasive in lying centrifugally on the flangeat'its angle of repose; and to prevent it, in cooperation'with the adjacent portion of flange 28 of slightly'reduceddiameter, from prematurely discharging from the cup; Abrasive issupplied-to the cup of the abrasive when the cup is full is "indicated by the line 6|.and the angle of repose, which is the angle between this line and a line parallel to the axis of rotation of the mechanism, is designated asBZ. The deflecting assembly may h assume various forms, andin Fig. 1 it assumes the shape of a w flange 53 which is so shaped at its outer periphery as to generally conform to the surface of the cone-shaped layer of abrasive lying in thefcup and iiaccordingly, a helix 'of increasi'ngradius toward thedis'charge edgeof the'cup.

" As moreclearly seen in Fig. 11,'the outer edge by means of a feed spout which is'stationarily supported in a'permanent position by any suitable means (not shown); "Spout 35 is provided 64 of flange 63is bevell'ed to" substantially conform with the angleofirepose or the abrasive 'lying' inthe cup. -"F1ang e;63 extendsfor approximately threequart'ers offia' revolution or about 2'79 with .the resultthat the abrasive with an inclinedportion 36 which terminates in a cylindrical'portion 31.

Portion 31 of the feed spout, which is the third element of the assembly, projects into a deflector assembly D, which is provided with an inner gen-' erally cone-shaped opening 38" and-acylindrical throat 39. Throat 39"is 'of'adiameter slightly greater than; terminal portion 31 of the spout,

with the-result thatthey'fit' suffi'ci'ently closely to prevent abrasive leakage between the parts, and yet permit the deflector assembly to be adjustedgto vary the direction of discharge'from the mechanism in a manner tobe hereinafter pointed out. The deflector assembly is, accordingly; provided with a flaring mouth through" which the abrasive is discharged tothe interior The deflector assembly "is provided with "a flange 4| whichis secured to a flange 42' of'a support 43 by means of a pair: 'o f nut and 'bolt assemblies 44i Support 43 extends through alignedapertures in a wheel housing 45 and a liner 46, and is provided with a fiange 41. Flange I 'siv'e to continue moi in'g' down are incline "until '40 starts to undergo an axial deflection -at'a point 65, and p is; finally deflected over the discharge edge" of the cup when; it; attains the point desigi-iated as 66 y j"---It has beeii ffound that it plow through the abrfa cup', but it ismerely-"necess yj to' disturb tr impart a slight initial movement tlieretofibecause the cone of increasing mum's cornp'el's thie abrait is discharged overthe edgeoflthe" dues- There- 'fore; the abrasive does q proeupe "severe wear on flange 53 J a v A Atpoint 66, flange '63 merges witha substantially cylindrical flange fi'l'which' has little,

if t, pitch and which? may be termed a tion of the'edg'e 33, and it functions/to prevent substantially in the plane of the dischargeper- 7 charge point is attained. Fla'nge'lil; according- 4T'is provided witha pairot arcuateslots 43 which fit over a pair of studs 49 secured toQhou sing 45, and a pair of nuts 5| are 'threaded'on studs 49 and cooperate with flange 4'! to rigidly maintainthe latter in contact with housing 45. If desired; nuts 5| may be loosened and support 43 rocked about the axis of the mechanism to -i i dispose the deflector assembly invarious angular positions to fth-ereby vary'fthe direction or the "discharge from the rotor in a inafte r pointed out.

i In order to properly center the support-and accurately position the deflector a'sse'mblywithin the feed chamber,- a plurality of 'set screws 52 are threaded "into-the support and are. adapted to be locked in place by nuts=53. Accordingly, "by looseninglnuts 53, set screws 52' may be threaded in orout to s'hift-the'SllPDQrttransversely of the axis of rotation (assuming nuts 5| have been loosened for this purpose) and the proper position accurately attained.

Spout as is supplied with abrasivewin any suit ly, terminates at the point 68' toqpermit the fdischarge at point 56 of the abrasive that isbeing properly propelled down the incline byflange 63. The abrasive lying on the interior of the cup is, accordingly, deflected ovrthe edge thereof at a predetermined pointin the rotatlonfof the wheel manner'to be hereand stray abrasive is prevented by flanges! from leaving the cup elsewhere.

The deflector in Figs. 1,,2, 10, and 11 is shown as being adjusted to cause the abrasivefltobe dislodged from the rim of the cupat'a'ppro ximately thejtwelve'oclock position. The abrasive is thrown fsubs'tantially tangentially, as indicated by the arrows 1 I in Fig. 2,-by reason o f'the fact that the abrasive possesses "substantially, no radial velocity and is traveling at the peripheral speed of the cup at the instant of' disch'argel' The" abrasive discharges over the inner edg s 33 of the cup C in a fan-shaped stream which is cut by the inner ends of the blades asthey successively pass thepick-uppoirit. Witnthe serrated 'orf notched edge, the discharge from ing Littledischarge edg i with a plurality 'Of 'everiaps the puter pei i phery of cup'Q-Gan'd axially projecting portions sorfiballlesfl3d which -preferabty :merge 3 into discha'rge icdge 33 talong nt-closelyte the eup;

. endw it teovi e h 'a bevelled surface-18 so asftb indli nedgsutfacfi33b. seen'iih" eysurfaces In- Figj 13 the discharge edge 3,3"ofthe' cup -33b are 'disposedfioi wardly of each blade conj is indicated by a broken line and the main dissiderable distanc'c so ithat slror tly after the' abra- 's-charge" -si vestream;oindioated' by the arrows d' l, isfcut' "ithe --off by 't-he inncr ends of thelbla'des a hri'ovls dl wh h swlll efiect am'cut -dff of the strham iitselii'i -ture iiischarlge o'f the' abrasi-ve,gand itisapparent pi'o iim'ately 45 of"notation-Hater llIn trier 'lo that e1 1 in place tlielstrlay abrasive 'Wordsithe blades aresupplied wiltabrasiveionly, di'catedsby iiarrowslfil-sis":restrainedsfrom fdiscover-"air are351F 15: and the abrasive stream is f charging: into rthe bladesand possi-bly'ibeing pre- -thenticut ofi to prevent it' fromfdischarg maturelydischarged therefromr 'lhe strayabra- ==the remainder :of the la'rge- -space behind eac siyeiq articlesirebound' from'fiahexinnensurface"of *bla'del: 2

It'is also apparent thatj as :the abras'ive 4115- 1 char'gingi'trom the -rizn is traveling in 'thesanie dischargedsirom the zedge'l-otcup .C. i

of abrasive' from theac'up isdesigna'ted by I nlso illustrated :in' this figure are dic'atei asmall sprayor .premaguard :L'l to fijoinrithe concentrated stream ibeing mf pointed.oiitiimconnection with iFigs.1:.toz6,

it is picked up withfa -minimuin3impact.' The neiitsz'a iy abrasive thattistprematurely dislodged abrasivepiekediuptisismoothly and continuously= from the surface of the abrasive lyingi the accelerated by theblades and is discharged fromf cup from being discharged onto the blades, and the outer ends. thereof in a downward direction v the'action. of the flange is enhanced by locating as indicated by the arrows 12 (Fig. 2). If it is it some distance rearwardly of the discharge desiredv to change the direction of discharge, edge 33fso that it directly cooperateswith the nuts 5| are loosened and support 43 is rocked surfaceof-the-abrasive lying on flange 28;.with

so as to simul'taneouslyrock the deflector asthe result" that the abrasive can only escape sembly in the proper direction to effect the defrom the cup where the flange 61 is discontinued, sired direction of discharge. The degree of adnamely, between points 66' and 68 (Fig.,11). As

. justment afforded by the slots'48 (Fig.2) allows the angle of repose assumed by the abrasive is thediscliarge stream to be adjusted through ap '30 constant for any given set of' operating condiproximately 90. v tions, and cannot build up beyond this angle be- If it ,is desired to direct the discharge uptweenfthe discharge edge and flange 61, thelatwardly, the support 43 may be removed,inverted -t'er,accordingly, prevents stray abrasive fromand replaced in the mechanism so as to locat'e" L escaping. fr m th -cup the deflector assembly 180 from the position It has been found in practice that all of theshown in Figs. 1 and 2, to effect an upwarddise parts of the deflector'assembly function cool in I charge of abrasive from the wheel; Also, in operation and Wear thereofi Flange .61 special installations,' where it is desired to disonly lightly bears against the surface" of the' cha ge the abrasive horizontally. the flec or abrasive, and as previously pointed out,- deflector may be secured to support 43 at an angle of 90 4o flange or helix 63 serves to initially dislodge the to that shown, to effect discharge of the abrasive abrasive, and the fact that the cone is of i either to one side of the machine-or the other. 7 creasing radius in the direction of the discharge It 1 Course, understood that housi 5 ay edge causes the abrasive to tend to continue more assume variou h p s p n n up n the .di down-the inc-line. However, the full length of rection it isdesired to throw the abrasive, and; .55 helix 63. controls. the movem'ent of 'the abrasive other factors peculiar to t e part cular instalacross the conical surfacefuntil it is finally. dislation involved. i J a charged atedge 33. Wear of the helix is slow, When the parts have become u S t however, because the major force impelling the equi replacement, nu are e ve and. abrasive toward the discha e edge is supplied the deflector and spou embly is removed from by centrifugal force, and the helix merely exerts the machine. Nut and bolt assemblies 44 may a minor or light following action upon the abrathen be loosened to permit thedeflector assem'; si v v I i g y to. be removed and repl ced. Also, if the As already described, a raised portion or ridge cup C requires replacement at this time, screw 2| is provided on blade B, and as seen in Fig; 6,

21 y be loosened o wh p to be r. it tapers Qfi'at Zla and merges into the blade moved. surface 29 inwardly of the mid-portion of the I In somefinstallations where it is desired to blade; [Ridge 2! is also provided with a sharpdirect a concentrated stream of abrasive upon ened inner end 2lb which constitutes an elongathe Wor means y e p y to restrict e tion of the bevelled inner end Zila of the'blade.

arcuate length, measured in degrees, of the dis: .When a deflector assembly as shown in Figs.* charge from the cup designated by the a rOWS' mend-:11 isused, the abrasive is discharged "l l in Fig. 2, and in Figs- 12, 13, 'and14 I. have substantially parallel to'the longitudinal axis of shown one form of meanslthat may be "employed the blades and along the center portion of the for this purpose. v blade surface. *Ridge 2| causes the abrasive to With Continued e e ence to these fig res, "be divided'an'd distributed evenly on both'sides flange 4 f pa t is ut away f r a p ion of its of the ridge, thereby difiusing or lessening the periphery to allow a guard assembly G to be intensity of wear on the central portion of the bolted securely to flange 42 ofsupport 43. The blade.

guard assembly comprises abaseportion'lfi which The'invention may be embodied in other speis provided with a pair of openings 16. Bolt cific forms without departing from the spirit or and nut assemblies cooperate with openings [5 essential characteristics thereof,-- The-present and a pair of corresponding openings in flange embodiment is thereforeto be considered men 42 (not-shown) to secure the guard assembly-in respects as, illustrative and not restrictive, the

place on support 43. Formed on base 15 :is a scope of the invention being indicated'by the I generally cylindricalmain guarding surface 11 l' 5 appended claims rather than by'the foregoing "description, and all changes which ;come ;vvithin the meaning and range of equivalency of the claims are therefore intendedtoxbe embraced therein.

I claim:

' 1. Inabrading' apparatus, a rotor including'a plurality of propelling blades extending inwardly short of the axis of the rotor, a cup mounted with the open end thereof between the inner ends of said propelling blades androtating with saidrotor, a plurality of circumferentiallyspacedEprojecticns extending from the open end of said cup,

means-for guidingabrasiveintothe cup whereby 2.--In abrading apparatus, a rotor including a plurality of propelling blades extending inwardly short of the axis of the rotor, a cup mounted with the, open end thereof between the inner ends of aid propelling blades and rotating with said rotor, a baflie formation of less circumferential .width than the circumferential spacing of the propellingrblades at the inner endsthereof extending axially from the open end of said cup and arranged rearwardly of the inner end oi each propelling blade with respect to the direction of rotation thereof, means for guiding abrasive into the cup whereby the abrasive may build up centhe abrasive may buildup centrifugally on:-the.,

"inner wall thereof, and means for deflecting;

propelling blades.

trifugallyon the inner surface thereof and means for deflecting abrasive from the open end of the cup at a predetermined zone in the rotation thereof for movement through spaces between said baflieforrnations. so as to be engaged by said ALTER L. KEEPER. 

